Kuznetsov NK-12
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The Kuznetsov NK-12 is a Soviet turboprop engine of the 1950s, designed by the Kuznetsov design bureau. It drives huge eight-bladed (four per propeller) contra-rotating propellers 18.4 ft (5.6 m) in diameter and weighing 2540 lb (1,155 kg) in the NK-12MV and 20.4 ft (6.2 m) in the NK-12MA.
The NK 12 turbo prop was developed in conjunction with German scientist evolving from late war German Turbo prop studies . This started with the post war development of the war time Jumo 012 turbo prop design that developed 6000 ehp in a 3000kg engine . The effort continued with a 5000 ehp engine that weight in at 1700kg , completed by 1947. The evolution to the TV-2 12000 Ehp engine required extensive use of new soviet developed alloys and was completed in 1951.
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The NK-12M developed 8,948 kW (12,000 ehp) uprated in the NK-12MV to 11,033 kW (14,795 ehp) and reaching 11,185 kW (15,000 ehp) in the NK-12MA. NK-12 is by a wide margin the most powerful turboprop engine ever built. It powered the Tupolev Tu-95 / Tu-142 bomber, the Tupolev Tu-114 airliner [NK-12MV] (still the world's fastest propeller-driven aircraft), and the Antonov An-22 Antheus [NK-12MA] – the world's largest aircraft at the time. It has also been used to power several types of amphibious assault craft, such as the A-90 Orlyonok ekranoplan.
The counter-rotating propellers are driven by a single 14-stage axial-flow compressor producing compression ratios between 9:1 to 13:1 according to altitude, controlled also by variable inlet guide vanes and blow-off valves. The combustion system used is a cannular-type: each flame tube is centrally mounted on a down-stream injector that ends in an annular secondary region. The single turbine is a five-stage axial. Mass flow is 65 kg (143 lb) /sec.
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